You have 60 % of water in your body. So the most prevalent molecule is H2O or water molecule in your body.
Tissues
Water
DNA
DNA
The most prevalent oxygen molecules in air have the formula O2, but there is another form called ozone that has the formula O3.
The water molecule, H2O, comprises 70% or more of living creatures.
H.2o
Water
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Calcium is the most prevalent in the human body.
I believe that would be tissue. Or rock. just flingin answers here.
Molecules are not living things. They are chemicals. Most things are composed of molecules of one kind or another, though.